<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript">
        var i = "55";
        var j = 55;
        alert(i==j);//true
        alert(i===j);//false
    </script>
</head>
<body>

</body>
</html>